中文摘要：

浮动凹弧底推杆-盘形凸轮组合机构的Ⅰ类综合问题即是其综合理论的重要内容，又是其工程推广应用的重要准备。然而，机构的Ⅰ类综合问题是一个十分复杂的问题，难以一次性解决。“运动保真条件”是Ⅰ类综合问题必须首先保证的重要前提性条件。将“支撑函数法”应用于浮动凹弧底推杆-盘形凸轮组合机构，成功解决了预设凸轮轴心 O1（xO1，yO1）条件下，凸轮曲率半径的通用公式和“运动保真条件”。在为未来解决该类机构Ⅰ类综合问题奠定重要前提基础同时，还将“支撑函数法”推广拓展为适用于新型组合机构的一种通用有效方法。

英文摘要：

The class Ⅰ synthesis problem of floating concave arc bottomed pushrod-disc cam com-bination mechanisms is not only an important content of its synthesis theories ,but also the basis of its engineering application .However ,the class Ⅰ synthesis problem is very complicated ,it is difficult to be resolved at once .＂Movement fidelity condition＂is an important prerequisite condi-tion of class Ⅰ synthesis problem .The ＂supporting function method＂is applied to floating con-cave arc pushrod-disc cam combination mechanisms .T he computational formula of curvature ra-dius and ＂movement fidelity conditions＂ of the cam mechanisms were studied and solved ,which met the premise of the class Ⅰ synthesis problem-preset the conditions of cam axis O1 （ xO1 , yO1 ） .The results lay an important theoretical foundation for solving the class Ⅰ synthesis prob-lem ,while the ＂supporting function method＂ is extended as a generic method to apply on new type combination mechanisms .